Java – spring MVC – did not get the value in the JSP view
•
Java
First of all, I am a novice in the spring MVC world
I made a simple program in which spring MVC will process the get request and set a variable named "message" This variable should display the set value in the JSP, but it did not execute as expected The code is compiling and running normally Can I tell you what's wrong here?
web. In XML
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>loginDispacher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>loginDispacher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
loginDispacher-servlet. In XML
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<context:component-scan base-package="com.sandeep" />
<!-- View resolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
Authorization. java
@Controller
@RequestMapping("/authorization")
public class Authorization {
String message = "This is message from Java class";
@RequestMapping(method=RequestMethod.GET)
public String printHello(ModelMap model){
System.out.println("From controller");
model.addAttribute("message","Hellow Spring MVC Framework!");
return "authorization";
}
}
Old authorization jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>Hello Spring MVC</title>
</head>
<body>
<h2> <c:out value="${message}" /> </h2>
</body>
</html>
Authorization of updates and work jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Hello Spring MVC</title>
</head>
<body>
<h2>
<c:out value="${message}" />
</h2>
</body>
</html>
yield
Solution
Your question has nothing to do with spring MVC$ {message} is el (expression language) It is part of Java EE (and the previous part of the JSP specification) For some reason, it cannot run on your page
Try replacing the web with the following Start of XML:
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
The content of this article comes from the network collection of netizens. It is used as a learning reference. The copyright belongs to the original author.
THE END
二维码